/**
 * file-upload-filepond.js
 *
 * Thin FilePond wrapper — replaces the old custom file-upload-queue.js.
 *
 * Architecture:
 *   1. Each <input type="file" class="tfe-file-picker"> is upgraded to a FilePond instance.
 *   2. FilePond handles drag-to-reorder, thumbnails, remove, validation — zero custom DOM.
 *   3. storeAsFile: true preserves native multipart form submission.
 *      Server receives files via $_FILES indexed by each input's name attribute
 *      (e.g. queue_file[tfe][], queue_file[video][], etc.).
 *   4. Validation rules are derived from ALLOWED_BY_TYPE (same as before).
 */

(function () {
	"use strict";

	// ── Constants (mirrors file-upload-queue.js ALLOWED_BY_TYPE) ──────────

	var ALLOWED_BY_TYPE = {
		tfe: {
			exts: ["jpg","jpeg","png","gif","webp","pdf","mp4","webm","ogv","mov","mp3","ogg","oga","wav","flac","aac","m4a","vtt","zip","tar","gz","tgz"],
			maxSize: function (f) { return (/\.pdf$/i.test(f.name) ? 100 : 500) * 1024 * 1024; },
		},
		video: {
			exts: ["mp4","webm","ogv","mov"],
			maxSize: function () { return 500 * 1024 * 1024; },
		},
		audio: {
			exts: ["mp3","ogg","oga","wav","flac","aac","m4a"],
			maxSize: function () { return 500 * 1024 * 1024; },
		},
		annexe: {
			exts: ["pdf","zip","tar","gz","tgz"],
			maxSize: function () { return 500 * 1024 * 1024; },
		},
	};

	// Map input id → queue type
	var INPUT_ID_TO_TYPE = {
		"tfe-files-input":    "tfe",
		"tfe-files-input-2":  "tfe",
		"video-files-input":  "video",
		"audio-files-input":  "audio",
		"annexe-files-input": "annexe",
	};

	function ext(fn) {
		var m = fn.match(/\.([^./]+)$/);
		return m ? m[1].toLowerCase() : "";
	}

	// ── FilePond configuration per queue type ─────────────────────────────

	function buildFilePondOptions(queueType, input) {
		var rules = ALLOWED_BY_TYPE[queueType];
		if (!rules) return null;

		// Build acceptedFileTypes from extensions
		var mimeMap = {
			jpg: "image/jpeg", jpeg: "image/jpeg", png: "image/png",
			gif: "image/gif", webp: "image/webp",
			pdf: "application/pdf",
			mp4: "video/mp4", webm: "video/webm", ogv: "video/ogg", mov: "video/quicktime",
			mp3: "audio/mpeg", ogg: "audio/ogg", oga: "audio/ogg", wav: "audio/wav",
			flac: "audio/flac", aac: "audio/aac", m4a: "audio/mp4",
			vtt: "text/vtt",
			zip: "application/zip", tar: "application/x-tar", gz: "application/gzip", tgz: "application/gzip",
		};
		var accepted = rules.exts.map(function(e) { return mimeMap[e] || ("." + e); });

		return {
			allowMultiple: (queueType !== "video" && queueType !== "audio"),
			allowReorder: true,
			storeAsFile: true,
			labelIdle: "Glissez-déposez vos fichiers ou <span class='filepond--label-action'>Parcourir</span>",
			acceptedFileTypes: accepted,
			labelFileTypeNotAllowed: "Type de fichier non accepté",
			fileValidateTypeLabelExpectedTypes: "Types acceptés : " + rules.exts.map(function(e) { return "." + e; }).join(", "),
			fileValidateSizeLabelMaxFileSize: function (fileSize) {
				var max = rules.maxSize({name: "", size: 0});
				return "Taille maximale : " + Math.round(max / 1024 / 1024) + " MB";
			},
			maxFileSize: function () {
				// We can't do per-file max based on extension easily with FilePond.
				// Use the larger limit and validate PDFs as a special case in the
				// beforeAddFile callback.
				return "500MB";
			},
			beforeAddFile: function (item) {
				var f = item.file;
				var max = rules.maxSize(f);
				if (f.size > max) {
					var maxMb = Math.round(max / 1024 / 1024);
					return {
						status: "error",
						main: "Fichier trop volumineux (" + (f.size / 1024 / 1024).toFixed(1) + " MB)",
						sub: "Maximum : " + maxMb + " MB."
					};
				}
				return true;
			},
		};
	}

	// ── Instance tracking ────────────────────────────────────────────────

	var _ponds = {};

	// ── Public API ────────────────────────────────────────────────────────

	/**
	 * Upgrade .tfe-file-picker inputs to FilePond instances.
	 * Called on page load and after HTMX swaps.
	 */
	function initFilePonds() {
		document.querySelectorAll(".tfe-file-picker").forEach(function (input) {
			// Skip already upgraded inputs
			if (input.dataset.filepondUpgraded) return;
			// Skip if input is inside an existing FilePond root
			if (input.closest(".filepond--root")) return;

			var id = input.id;
			var queueType = INPUT_ID_TO_TYPE[id];
			if (!queueType) {
				// Try to infer from data attr on the container
				var container = input.closest("[data-queue-type]");
				if (container) queueType = container.dataset.queueType;
			}
			if (!queueType) return;

			var options = buildFilePondOptions(queueType, input);
			if (!options) return;

			// Preserve the input's original name for form submission
			options.name = input.getAttribute("name") || input.name || "";

			var pond = FilePond.create(input, options);
			input.dataset.filepondUpgraded = "1";

			// Track by id for cleanup
			var key = id || queueType;
			_ponds[key] = pond;
		});
	}

	/**
	 * Destroy all FilePond instances and restore original inputs.
	 * Called before HTMX swaps that replace the file block.
	 */
	function destroyFilePonds() {
		Object.keys(_ponds).forEach(function (key) {
			try {
				_ponds[key].destroy();
			} catch (_) { /* ignore */ }
			delete _ponds[key];
		});
		// Also catch any stray instances (HTMX may have replaced DOM)
		document.querySelectorAll(".tfe-file-picker[data-filepond-upgraded]").forEach(function (input) {
			delete input.dataset.filepondUpgraded;
		});
	}

	// ── HTMX integration ─────────────────────────────────────────────────

	/**
	 * Called before HTMX replaces the #format-fichiers-block.
	 * We must destroy FilePond instances on the soon-to-be-removed DOM nodes
	 * to avoid leaks and file-state conflicts.
	 */
	function onHtmxBeforeSwap(evt) {
		// Only care about format-fichiers-block swaps
		if (evt.detail.target && (
			evt.detail.target.id === "format-fichiers-block" ||
			evt.detail.target.closest && evt.detail.target.closest("#format-fichiers-block")
		)) {
			destroyFilePonds();
		}
	}

	// ── Bootstrap ─────────────────────────────────────────────────────────

	// Hook into HTMX events if htmx is loaded
	if (window.htmx) {
		window.htmx.on("htmx:beforeSwap", onHtmxBeforeSwap);
	}

	// Initialise on DOM ready
	if (document.readyState === "loading") {
		document.addEventListener("DOMContentLoaded", function () {
			initFilePonds();
			// Re-init handles HTMX after-swap
			if (window.htmx) {
				window.htmx.on("htmx:afterSwap", function () {
					initFilePonds();
				});
			}
		});
	} else {
		initFilePonds();
		if (window.htmx) {
			window.htmx.on("htmx:afterSwap", function () {
				initFilePonds();
			});
		}
	}

	// ── Mark form dirty on FilePond changes (beforeunload guard) ─────────
	document.addEventListener("FilePond:addfile", function () {
		window.__xamxamDirty = true;
	});

	// Clean dirty flag on form submit (matches beforeunload-guard.js)
	document.addEventListener("submit", function (e) {
		var form = e.target;
		if (form && form.hasAttribute && form.hasAttribute("data-beforeunload-guard")) {
			window.__xamxamDirty = false;
		}
	});

})();